Can literature analysis identify innovation drivers in drug discovery?

Nat Rev Drug Discov · 2009 · PMC7097144 · PMID 19876041

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an apparent trendno p-value reported

It is also possible to measure article impact independently of journal impact by directly consulting citation data of individual publications, especially given an apparent trend in the scientific community towards citing fewer and more recent articles 35 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.